Drying kiln



Jan. 7, 1930. R. DE REYTERE 1,742,586

" DRYING KILNv Filed July 5, 1928 2 sheets-'sheer 2 Patented Jan. 7, 1.930

um'na'zn`v sTATasPAfT-ENII OFFICE normar nn manner coantenna Application med my 5,1928, srm no.' 590,513, ana'm :einem my 11,1927;

This invention relates to a drying vkiln for various materials, especially for clay, sand, chalk and various earths. As is well known,

Vmaterials of this `kind have been dried'until now in a general way, bymeans of cast iron plates on which the materialfis disposed and which are heatedby a suitable source of heat. rlhe result is that the drying operation takes place intermittently and under especially un-4 m favourable conditions, from the point of 'vlew of the utilization of the heat.

The present invention has for object to .obviate those inconveniences and to carry ,out the operation Vin a continuous and rational manner, in utilizing as completely as gases of combustion from the furnace used to heat possible the heat contained in the the drying kiln, and at the same time to avoid any calcination of thecproducts treated. 2o

and pointed out in the appended claims. 0n the annexed drawings: Figure is a longitudinal vertical section of the completed drying kiln. Figure 2 is a cross section on the line 2-2 of Figure 1. y

-Figure 3 is a front elevation anda half View in section on the line 3'3 of Fi re 1.

Figure 4 is a plan view of the drying kiln. As shown in these drawings, the drying kiln consists of a block of masonry 1, in the front of'which is disposed a furnace 2, communicating with 4a flue 3 in refractory material, extending the whole length .of the'A hln in the block 1, from which it is insulated by a layer of non-conducting -material 4.

This flue 3 communicates, at the end removedo from the' furnace, by an o ening with avflue 6, formed of cast iron p ates arranged in ridge shape on the flue 3 and supported b joists 8 and bolts 9 connecting the' plates to eachother. This flue 6, disposed in the in-v terior cavity 10 of the kiln communicates, at

the end adjacent the furnace 2, by transverse l ducts 11 wlth two liues 12 disposed along the walls 13 of the drying kiln.

These flues 12, which for instance may be of sheet iron, and disposed between layers With this object in view, the invention con- Sists in the special arrangements and comb1; nations of parts hereinafter fully described of joists 14r and 15, may be open at the end "16 sothat the'gasesare directed into the space Y 17, to allow themto escape directly by a lontudinal opening 18 which extends above the ue 6 and serves for the feed openin v In the example shown, above the ue 3 in refractory material, is disposed an auxiliary ilue 19, communicating at the front of the kiln with the atmosphere b an'opening 20.

This iuecommunicates at t e back end with passages 21 which communicate with adu'ct 22 `formed of a bent or curved sheet disposed above the'top 4of the flue 6 on a supporting joist, so that the air aspired by the opening 20 and having circulated in the flue 19 may escape from the duct22 laterally by the longitudinal opening 23, intocthe 'feed openll'lg 18. y v I c x As shown in the drawing, the feed opening `the openings 26.

When in-operation, the material to be dried is introduced by the 'feed opening l13 and descends over the inclined walls?v of the iue 6 and over the sheets forming the longitudinal 85 iues' 12, to slide ,on the inclined plane 25 and to escape,'after1drying, by the openings 26, During this passage of the material, the hot ases from -the furnace 2 circulate first in v the ne 3 and 'pass by the opening 5 into the 9e 'lue, and then by the ducts 11 into the'two y side lines 12 and escape either into the chimney, or by -the spaces 17 into the material under treatment which fillsthe spaces 10. Simultaneously the atmospheric air, drawn 'es into the flue 19 is heated by contact with the d 'arch of the iue in refractory materia-l 3, and

passes by the duct 21 into the longitudinal duct 22, from which it is spread uniformly in the material under treatment, by the 'open 100 be understood, the material under treatment entering the kiln, is lirst subjected to the drying action of the hot air, which has recuperated the heat from the top of the Hue 3. Then it is subjected to the action of the heat transmitted to the cast iron plates 7 by the gases circulating tin this flue and to the action of the-heat given up to the metallic walls of the Hues 12 and finally to the action of the heat transmitted by the side walls of the Hue 3. Further, as soon as it enters the s aces 10, it may be subjected to the action of t estill hot gases which escape from the Hues 12 by the openings 16 and pass through the relatively moist material which 1s descending throu h the feed opening 12. This drying kiln t ei'efore realizes continuous operation and rational drying, the material being subjected to increasingly high temperatures as a it descends in the spaces 10.

The device as described allows, in case the passage of the gases through the material in treatment is not of importance, to recuperatel all the heat contained in these gases for drying the material. If the material may not come in contact with the gases, these are evac-` uated directly into a chimney at the end of the Hues l2. A

In case it is desired to dry fairly compact materials, for instance sand, there may be arranged, as shown in Figure' 2 in broken lines,

Aalong the feed oplening 18 and above the duct 22, plates 27 W ich form passages 28, into which o en the'escape the moisture to escape, especiallyl at the beginning of the drying process.

1. In a drying kiln for various materials especially for clay, sand, chalk and other earths, in combination a block of masonry, a furnace at one end of the kiln, a longitudinal Hue communicating with the said furnace and in which the gases produced in the furnace escape, a second longitudinal Hue arranged above the said Hr'st longitudinal Hue, means whereby the two said longitudinal Hues communicate at the end removed from the furnace, two side Hues means whereby the saidv side Hues communicate with the second longitudinal Hue atthe end adjacent the furnace,

the two side Hues cooperating with thetwo longitudinal Hues in order to form spaces with inclined walls for the passage of the material to be treated, and means whereby the hot gases are evacuated.

2. In a drying kiln for various materials especially for clay, sand, chalk and other earths, in combination, a b lock of masonry, a furnace at one end of the kiln, a longitudinal Hue communicating with theV said furnace and in which the gases produced in the furnace escape, a 'second longitudinal Hue arranged above the said Hrst longitudinal Hue, means whereby the two said longitudinal Hues com? ducts 29, so as to allow municate at the end removed from the furnace, two side Hues, means whereby the said side Hues communicate with the second longitudinal Hue at the end adjacent the furnace, the two side Hues cooperating with the two lon 'tudinal Hues in order to form s aces wit inclined walls for the passage o? the material to be treated and means whereby the material to. be dried is traversed by the hot gases escaping from-the side Hues when enter the said spaces.

nace, two side Hues, means whereby the said side Hues communicate with the second longitudinal Hue at the end adjacent the furnace, the two side Hues. cooperating with the two longitudinal Hues inorder to form spaces with inclined walls for the passage of the material to be treated,.a longitudinal Hue open at the atmosphere and\ extending between the two longitudinal 'Hues for the gases, the air aspirated by the said Hue being heated through the contact of the gases, means whereby the hotair is distributed in the material to be treatedand means whereby the hot gases are evacuated. l

4. In a drying kiln for various materials especially .for clay, sand, chalk and other earths, in combination, a block of masonry, a furnace at one end of the kiln, a longitudinal Hue communicating with the said furnace and in which the gases produced in the fur- `nace escape, a second longitudinal Hue artwo longitudinal Hues, in order to form spaces with inclined walls for the passage of the material to be treated, a longitudinal Hue open at the atmosphere -and extending between the two longitudinal Hues for the gases, a longitudinal Hue arranged above the said second longitudinal Hue for the gases, and

means whereby the air aspirated from the atmosphere and heated through the contact of the gases, is adapted to escape into the material to be treated and means whereby the material to bedried is traversed by the hot gases escaping from the side Hues when entering the said spaces.

5. In a dryin kiln for various materials especially for c ay, sand, chalk and other earths, in combination, a block 0f masonry, a furnace at one end of the kiln, a longitudinal Hue communicating with the said furnace and in which the gases produced in the furnace escape, cast iron plates arran ed in ridge sha e above the said first Hue W ereby a secondp longitudinal Hue is formed,v said second longitudinal Hue being in communication with the first mentioned longitudinal Hue at av point remote from the furnace, a side Hue on each side of and arranged in spaced relation to said longitudinal Hues, said side Hues being in communication with the second longitudif nal Hue at the end adjacent the furnace, the two side Hues cooperating with the two longitudinal Hues in order to form spaces with l inclined walls for the passage of the material to be treated and means whereby the said material is traversed by the hot gases escaping from the said side Hues, when entering the said spaces.

6. In a drying kiln for various materials especially for clay, sand, chalk and other earths, in combination, a block of masonry, a furnace at one end of the kiln, a longitudinal Hue communicating with the said furnace-and in which the gases produced in the furnace escape, a second longitudinal Hue arranged abovethe said YHrstlongitudinal Hue, means whereby the two said longitudinal Hues communicate at the end removed from the furnace, two side Hues, means whereby the said side Hues communicate with the second longitudinal Hue at the end adjacent the furnace, the two side Hues cooperating with the two longitudinal Hues in order to form spaces with inclined walls for the passage of the material to be treated, and means whereby the hot gases are evacuated, ducts formed along the feed opening of the said spaces for the.A material, whereby the discharge of the moisture is facilitated. 7. In a drying kiln for various materials especially for clay, sand,` chalk and other earths, in combination, a block of masonry, a furnace at one end of the kiln, spaces in which the material to be dried is introduced, a longitudinal Hue communicating with the said furnace and in which the gases produced in the furnace escape, cast iron plates arranged in ridge shape above the said` Hue whereby a second longitudinal Hue is formed, means whereby the said second longitudinal Hue communicates with the first longitudinal HueV at the end removed from the furnace, two side arranged beyond and in spaced relation to the longitudinal Hues, each side Hue being in communication with one of the longitudinal 4Hues at the end ofthe kiln adjacent the furnace, the uppermost longitudinal Hue and the side Hues presenting spaced parallel inclined walls of high heat conductivity defining a passage for the material to be dried.

9. A drying kiln including a furnace, superimposed longitudinal Hues, one of said Hues being directly open to the products of combustion from the furnace and said Hues i being in communication with each\ other at the end remote from the furnace, side Hues arranged beyond and in spaced relation to the longitudinal Hues, each side Hue being in communication with one of the longitudinal Hues at the end'of the kiln adjacent the furnace, the uppermost longitudinal Hue and the side Hues presenting spaced parallel inclined walls of vhigh heat conductivity defining a passage for the. material to be driedfan inlet for the material from which the material is directed to the material passage between the Hues by gravity, and means for directing the products of combustion from the ends of the side Hues remote from ,the furnace through said material adjacent the inlet.

In testimony whereof I have aiiixed vmy signature. j

ROBERT DE .REYTERE Hues, means whereby the said side Huescom municate with the said second longitudinal Hue at the end adjacent the furnace and means whereby the hot gases are evacuated.

8. A drying kiln including a furnace, superimposed longitudinal Hues, one of said Hues being directly open to the products of combustion from they furnace and said Hues being in communication with each other at the end remote from the furnace, side Hues 

